/Engine/Plugins/Online/OnlineFramework/Source/Party/Public/Chatroom.h
Chat room functions Try to join a chat room by calling CreateRoom, will either create or join if it already exists
void CreateOrJoinChatRoom ( [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) LocalUserId, [FChatRoomId](API\Plugins\OnlineSubsystem\Interfaces\FChatRoomId) ChatRoomId, [FOnChatRoomCreatedOrJoined](API\Plugins\Party\FOnChatRoomCreatedOrJoined) CompletionDelegate, [FChatRoomConfig](API\Plugins\OnlineSubsystem\Interfaces\FChatRoomConfig) RoomConfig )